Understanding the Spring Boot Project Structure
Tour a freshly generated Spring Boot 4 project to understand its folders, build files, and the role of each generated artifact.
Understanding the Spring Boot Project Structure is a free Spring Boot 4 Complete Guide lesson on CoddyKit — lesson 4 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Spring Boot 4 Complete Guide learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.
What You Get from Spring Initializr
Spring Initializr hands you a ready-to-run skeleton: a build file, a main class, a properties file, and a test class. Knowing each part lets you navigate with confidence.
The Build File
The build file — pom.xml for Maven, build.gradle for Gradle — declares your dependencies, Java version, and the Spring Boot plugin that packages the app.
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>Starter Dependencies
A starter is a curated bundle of libraries. spring-boot-starter-web pulls in everything for a web app, so you never juggle individual versions.
The Main Application Class
The main class is your entry point: annotated with @SpringBootApplication and holding a standard Java main method that boots the framework.
@SpringBootApplication
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}Standard Source Layout
Stick to the convention: code in src/main/java, config and assets in src/main/resources, and tests under src/test. Spring Boot finds it all automatically.
The Resources Folder
The resources folder holds application.properties (or .yml) for config, static/ for assets, and templates/ for views.
server.port=8080
spring.application.name=demoWhy Package Placement Matters
Spring Boot scans from your main class's package downward. Keep controllers and services in sub-packages of that root so they're discovered automatically.
The Maven/Gradle Wrapper
The wrapper scripts (mvnw, gradlew) let anyone build the project without installing Maven or Gradle, locking in a consistent tool version.
./mvnw spring-boot:runGenerated Test Class
Initializr adds a context-load test with @SpringBootTest. If the application context starts cleanly, the test passes — proving your wiring is valid.
@SpringBootTest
class DemoApplicationTests {
@Test
void contextLoads() {
}
}Build Artifacts
Building outputs to target/ (Maven) or build/ (Gradle), including a runnable fat JAR that bundles your code plus an embedded server.
Running the Application
You can run the app three ways: from your IDE, via the wrapper, or by executing the packaged JAR. All three start the embedded server.
java -jar target/demo-0.0.1-SNAPSHOT.jarQuick Check
Can you place each piece of the project structure? Let's find out.
Recap
You toured the build file, starters, main class, resources, source layout, wrappers, and artifacts. Knowing this structure makes the rest of Spring Boot click.
Frequently asked questions
Is the “Understanding the Spring Boot Project Structure” lesson free?
Yes — the full text of “Understanding the Spring Boot Project Structure” is free to read here on the web, and the Spring Boot 4 Complete Guide course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Spring Boot 4 Complete Guide course, upgrade to CoddyKit PRO.
What will I learn in “Understanding the Spring Boot Project Structure”?
Tour a freshly generated Spring Boot 4 project to understand its folders, build files, and the role of each generated artifact. You practise Spring Boot 4 Complete Guide with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start Spring Boot 4 Complete Guide?
No prior experience is required. Spring Boot 4 Complete Guide on CoddyKit is structured for beginners through advanced learners; this is — lesson 4 of 4, so you can start here or from the beginning and move at your own pace.
How long does the “Understanding the Spring Boot Project Structure” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this Spring Boot 4 Complete Guide lesson?
Yes. Every Spring Boot 4 Complete Guide lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.
All lessons in this course
- Introduction to Spring Boot 4
- Creating Your First Application
- Spring Boot Auto-Configuration
- Understanding the Spring Boot Project Structure